2022-07-05-世界卫生组织-Immunization_Vanuatu_2022_country_profile_17页_372kb

Summary of WHO and UNICEF Immunization Coverage Estimates for Vanuatu (2022)

Methods and Overview

WHO and UNICEF estimate national immunization coverage using data from national governments, administrative records, and surveys. Estimates are country-specific, not borrowed, and adjusted for potential biases. The Grade of Confidence (GoC) reflects the level of empirical support, with higher confidence indicating stronger data. Key vaccines assessed include BCG, DTP, MCV, Polio, Hepatitis B, and others; estimates may be challenged due to data limitations. The analysis accounts for global events like COVID-19 disruptions, which caused declines in coverage.

Key Findings for Vanuatu

• Coverage Trends: Average coverage was higher in the early 2000s (e.g., around 80-90% for DTP and MCV). COVID-19 led to significant drops in 2020-2021 for several vaccines, such as DTP3, MCV1, and Pol3, aligning with global service disruptions. More recent estimates stabilize but remain variable.
• Vaccine-Specific Insights:
  • BCG: Generally stable, except for occasional declines; high GoC due to consistent reporting.
  • DTP: Coverage fluctuated, with peaks in 2013-2014 but a sharp drop in 2020-2021; GoC challenged in years with unexplained declines.
  • Polio: Coverage declined in recent years, including undetected cards or unsampled data; introduced IPV in 2015.
  • Measles (MCV): Early years high, though estimates were sometimes calibrated to earlier levels; lower confidence due to calibration from older data.
  • Newer Vaccines: RotaC and PcV3 (2021) showed low coverage upon introduction, with data starting recently.
• Factors Affecting Coverage: Service interruptions caused by COVID-19 were primary drivers of declines. Data quality varies, with some estimates based on surveys to correct reported figures. Administrative data often unexplained.
• Data Quality and Confidence: GoC (e.g., ••• for well-supported, • for challenged) indicates data reliability; estimates should be used cautiously, as precision is not provided via confidence intervals.

Data Sources

Estimates rely on national reports, surveys (e.g., Vanuatu Vaccination Coverage Surveys), and global databases. Ongoing efforts facilitate verification and revisions. For detailed data, refer to the provided URLs.

Disclaimer: WHO and UNICEF take no responsibility for damages arising from use; estimates may contain biases.